/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/OnlineAsyncOp.h
[TOnlineEvent](API\Plugins\OnlineServicesInterface\Online\TOnlineEvent)< void(const [TOnlineAsyncOp](API\Plugins\OnlineServicesCommon\Online\TOnlineAsyncOp)< OpType > &)> OnStart()